Exam AZ-204 topic 3 question 25 discussion

1. Monitor the progress of the change feed processor Feature: Lease container Reason: The Lease container is responsible for tracking the progress of the change feed processor. It maintains state information, ensuring that the change feed processor knows where it left off and can resume from the correct point in the feed. This allows the system to monitor the progress and distribute the workload across multiple instances if needed. 2. Prevent the change feed processor from retrying the entire batch when one document cannot be read Feature: Dead-letter queue Reason: The Dead-letter queue allows you to handle documents that cannot be processed. If a document cannot be read or processed, instead of failing the entire batch, the problematic document is moved to a dead-letter queue, allowing the change feed processor to continue processing the rest of the batch without retrying the failed document.

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To prevent your change feed processor from getting "stuck" continuously retrying the same batch of changes, you should add logic in your delegate code to write documents, upon exception, to an errored-message queue. This design ensures that you can keep track of unprocessed changes while still being able to continue to process future changes. The errored-message queue might be another Azure Cosmos DB container. The exact data store does not matter, simply that the unprocessed changes are persisted. In addition, you can use the change feed estimator to monitor the progress of your change feed processor instances as they read the change feed or use the life cycle notifications to detect underlying failures.

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It is do-it-your self stuff: "To prevent your change feed processor from getting "stuck" continuously retrying the same batch of changes, you should add logic in your delegate code to write documents, upon exception, to a dead-letter queue " https://learn.microsoft.com/en-us/azure/cosmos-db/sql/change-feed-processor?tabs=dotnet